Diffusion: Pretty Great particles measuring under 0.1 micron get bounced about randomly and they are slowed by their interactions with atmospheric atoms and molecules. They finally drift or get bounced into a filter fiber, whereupon (all over again) they adhere inside a process called diffusion. จัดส่งฟรี! เมื่อสั่งซื้อเครื่องกรองอากาศทุกรุ่น The filter on https://www.mannature.com